Process for the enameling of metals, wires, and metal structures



May 27, 192%. 11,495,632

L. DE RAPHELlS-SOISSAN PROCESS FOR THE ENAMELING 0F METALS, WIRES, AND METAL STRUCTURES Filed June 24, 1922 IO e14 wgrnef Patented May 2-7, .1924,

iaaaaaa LOUIS DE RAPHELIS-SOISSAN, OF MARSEILLE, FRANCE.-

Application filed June 24, 1922. Serial m5. 570,725.

To all. whom it may concern:

Be it known that I, LOUIS on RAPHIELIs- SOISSAN, a citizen of the Republic of France, residing at Marseille, France, have invented 5 certain new and useful Improvements in Processes for the Enameling of Metals, Wires, and Metal Structures, of which the following is a specification.

This invention relates to an enameling rocess and more particularly to a process or the enameling of electric wires; the'object of the invention being to permit of the final shaping'of the wire before the application of the heat. According'to the present 1 invention the wire is coated with a ground layer of a porous substance which will not melt at the melting, temperature of enamel, nor carbonize at such temperature, nor react chemically with the unde'rlaying metal;- for example, asbestos in any suitable form may be employed.

On the said ground layer, which may consist of a wound or woven filament, or of an envelope, the fusible enamel in powder form is applied either directly or in combination with a glue solution, said powder in melting giving the finished enamel.

Due to the previous application of the ound layer of porous substance which oes not melt or carbonize at the melting temperature of the enamel, .it is possible to obtain after the application of the heat a better and more complete adhesion of the enamel coating which in melting closes the interstices of the porous substance used as the ground layer; and this action results in a greater tenacity as well as greater elasticity than could be obtained with the usual direct enameling processes not utilizing a 40 ground layer.

In the case, for example, of a wire structuresuchf'as a relay or coil in which the ground-"layer is of asbestos in threads, the naked wire is first covered with one or more strata of asbestos thread windings. The asbestos thread may be replaced by a coating of asbestos in wire. U on the as estos layer a coating of powdere enamel is incorporated by means of a known agglutinating substance, for instance liquid g ue and the powdered enamel increasing rigidity and protectingthe struothe wire thus raising its temperature to the point necessary to melt enamel.

owderypasted onto the Y in melting effects the enameling of the work. Otherwise the enamel powder may be incorporated with the asbestos thread before its application on the naked wire. When the coated structure has dried, the asbestos effectively retains the enamel powder, thus permitting of the final shaping of the structure before the application to heat, even in such cases in which the'structure is surrounded by an envelope.

As soon as the structure has received its final form, it is exposed to a temperature high enough to ensure the proper melting of the enamel on the whole surface. The structure is thus coated with a closely adhering stratum of enamel, insulating electrically the metal parts of the structure,

ture from the action of air.

For the application of the necessary heat to melt the enamel the heat may be very simply produced by causing an electric current of suificient intensity to flow through The enameling substance, which'in mel ing gives the finished product is chosen according to the metal employed, and so that the melting temperature of the powder is below the melting temperature of the metal wire, and that the coefiicients of expansion of the dilferentingredients 0 not differ too greatly; also taking care that when heating no chemical combination shall take place between the metal structure and the enameling powder.

On the accompanying drawing, given as an example of an execution of the invention:

Figs. 1, 2 and 3 show respectively in eleva-' tion, in longitudinal section and in transversal section a wire covered with a layer or tissue of flexible stufi containing the enamel powder.

In the drawing: A is the naked wire and 06 B is the layer or tissue of flexible ,stufi containing the powdered enamel.

What I claim is In a process for the manufacture of insulated enamelled electric wires; in which f the wire is to be insulated by enameling, first coating'the wire with a g'rounistratum of a fiexiiole porous slflostatnoe suhsequentlir In testimon whereof I afix my signetute applying a, stratum of powdered ename in presence 0 two Witnesses. setting the Wire in the proper shape, and

finally heatin to the de%ree necessary to LQUIS DE RAPHELIS'SQISSAN melt the pow eredl ename constituting the Witnesses:

insulating coating resting upon the hose on? EUGENE DnoAAssoN,

ground stratum ALEXANDER S. Gnwonn. 

